Things to do (San Francisco)

I wonder if anyone might be able to help me. I am coming to California with my family (kids aged 5,9 and Protected content July and was wondering what people would suggest that might be a good itinerary for me. I land in San Francisco on the 18th of July and fly out from Fort Lauderdale on the 15th of August. All I have booked so far is the flights from Sweden to USA. The only place I have to be at is in Vegas on the 26th.

My kids really wanted to go to Florida, so I though maybe a week to 10 days at the end of our trip would be great.